IEC 61508-1 PDF

Those requirements are listed in a document called the certification scheme. IEC certification programs are operated by impartial third party organizations called certification bodies CB. Certification bodies are accredited to perform the auditing, assessment, and testing work by an accreditation body AB. There is often one national AB in each country. IEC certification programs have been established by several global Certification Bodies.

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Those requirements are listed in a document called the certification scheme. IEC certification programs are operated by impartial third party organizations called certification bodies CB.

Certification bodies are accredited to perform the auditing, assessment, and testing work by an accreditation body AB. There is often one national AB in each country. IEC certification programs have been established by several global Certification Bodies. Each has defined their own scheme based upon IEC and other functional safety standards.

The scheme lists the referenced standards and specifies procedures which describes their test methods, surveillance audit policy, public documentation policies, and other specific aspects of their program. It is being widely adopted by the major car manufacturers.

Before the launch of ISO , the development of software for safety related automotive systems was predominantly covered by the Motor Industry Software Reliability Association guidelines.

A set of guidelines for the development of vehicle based software was published in November MISRA C has gone on to become the de facto standard for embedded C programming in the majority of safety-related industries, and is also used to improve software quality even where safety is not the main consideration.

MISRA has also developed guidelines for the use of model based development. It is intended to cover the development of software for railway control and protection including communications, signaling and processing systems. Process industries[ edit ] The process industry sector includes many types of manufacturing processes, such as refineries, petrochemical, chemical, pharmaceutical, pulp and paper, and power.

IEC is a technical standard which sets out practices in the engineering of systems that ensure the safety of an industrial process through the use of instrumentation.

Nuclear power plants[ edit ] IEC provides requirements and recommendations for the instrumentation and control for systems important to safety of nuclear power plants. It indicates the general requirements for systems that contain conventional hardwired equipment, computer-based equipment or a combination of both types of equipment.

It provides requirements that are applicable to the system level design of all types of machinery safety-related electrical control systems and also for the design of non-complex subsystems or devices.

Testing software[ edit ] Software written in accordance with IEC may need to be unit tested , depending up on the SIL level it needs to achieve. The main requirement in Unit Testing is to ensure that the software is fully tested at the function level and that all possible branches and paths are taken through the software.

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